Before i drove 240 all highway miles last Thursday, I added CD-2 to my hm oil in my 95 Camry.Today, i also drove the same amount,to the same location and i am still not seeing darkening of my [email protected]#$ oil! lol.... I have looked inside of the oil filler hole and i do see what appears to be hard carbon on the valve cover and i think on the cyl. head. The engine has 160,xxx miles.I also noticed that when i start it up in the mornings now,it'll smoke for a few seconds now. False seal being cleared?